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Related Experiment Videos

Clear cell sarcoma arising in the transverse colon.

T Fukuda1, T Kakihara, K Baba

  • 1Second Department of Pathology, Fukushima Medical University School of Medicine, Fukushima, Japan.

Pathology International
|June 10, 2000
PubMed
Summary

Clear cell sarcoma (CCS) of the colon is a rare malignancy. This case highlights a transverse colon tumor with epithelioid cells, melanin pigment, and the EWS-ATF-1 fusion gene, confirming CCS diagnosis.

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Area of Science:

  • Oncology
  • Gastrointestinal Pathology
  • Molecular Diagnostics

Background:

  • Clear cell sarcoma (CCS) is a rare soft tissue sarcoma.
  • Colonic sarcomas are uncommon, with clear cell morphology being exceptionally rare.
  • Accurate diagnosis of rare tumors is crucial for appropriate management.

Observation:

  • A case of clear cell sarcoma (CCS) originating in the transverse colon is described.
  • Histological examination revealed epithelioid malignant cells with clear cytoplasm and pleomorphic nuclei.
  • Melanin pigment was detected in some tumor cells via histochemical and ultrastructural analysis.

Findings:

  • Immunohistochemistry showed positive staining for HMB45 and S-100 protein.
  • A metastatic nodule exhibited similar histology but lacked melanin.

Related Experiment Videos

  • Reverse transcriptase-polymerase chain reaction confirmed the presence of the EWS-ATF-1 fusion gene in the metastatic lesion.

    • Implications:

    • This case expands the known spectrum of clear cell sarcoma (CCS) locations.
    • The presence of the EWS-ATF-1 fusion gene is a key diagnostic marker for CCS.
    • Early and accurate diagnosis of rare colonic tumors like CCS is vital for patient outcomes.